TWO men were today jailed for life for the gruesome murder of a fellow inmate at a North East jail.

TWO men were today jailed for life for the gruesome murder of a fellow inmate at a North East jail.Nathan Mann and Michael Parr killed Mitchell Harrison at Frankland Prison by slitting his throat, stabbing him in the eye with a pen and cutting open his stomach.

Newcastle Crown Court heard the pair planned to cut Mr Mitchell’s liver in half and eat it but were unable to go through with their plan.

Psychopath Mann, who admitted manslaughter on the grounds of diminished responsibility, was jailed for life with a minimum of 16 years. That sentence will run consecutive to the life sentence with a minimum of 24 years he was already serving for a double murder in Leicester, meaning he must do at least 40 years.

Parr, who admitted murder, was jailed for life with a minimum term of 32 years.

Both men were warned by Mr Justice Openshaw they may never be released because they are so dangerous.

Parr, 33, and Nathan Mann, 24, shared fantasies of killing while serving life sentences in neighbouring cells at Frankland Prison.

They lured child rapist Mitchell Harrison, 23, into Mann’s cell where he was pinned down by Parr and killed by Mann.

Harrison, who was serving an indeterminate sentence for raping a 13-year-old girl in Kendal, Cumbria, in 2009, was found dead by prison guards as they released inmates from their cells on the morning of October 1 2011.

Robert Smith QC said Mann told prison staff he had attacked Harrison.

"He told prison officer Graham in a calm manner that there was a dead body in the cell," he said.

Officers found Harrison lying on the bed, surrounded by blood.

"When asked why they did this, both of them shrugged their shoulders," Mr Smith said.

"Nathan Mann said he had chosen the deceased because he was arrogant and they didn’t like him.

"He said they had planned it for a while and just fancied doing it.

"There was nothing to suggest a fight or even a scuffle had taken place."

Mann said he tried to snap Harrison’s neck before proceeding with the horrific attack, the court heard.

Both men were arrested and taken to Durham police station, where Mann admitted he and Parr had shared fantasies about killing.

"Nathan Mann told police that, after he had come to know his co-accused, he told Parr he had thoughts about killing people and that Parr had told him he thought the same way," Mr Smith said.

"They both agreed that they would do it and that they would eat his liver afterwards.

"They intended to remove his liver and cut it in half so they could both eat it."

But they were too shocked by the injuries they had inflicted to go through with it, he added.